Sorry chevyboyac, but you are experiencing a common problem to German cars.

Very, very difficult to diagnose. Over time it may get worse and the CEL may come on. Problem may be related to MAF sensor, may be related to O2 sensors, or some piece of the emissions equipment.

A good thing to have may be something like OBDKEY, which allows you to read all the sensors real time and display on a computer. Then you will be able to see if any sensor is stuck, giving you bad values. The price ($150ish) is worth it if you think about all the headache you are saving.